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Ntawuruhunga, PheneasLegg, J.P.[New spread of Cassava Brown streak virus disease and its implications for the movement of cassava germplasm in the east and central African region]New spread of Cassava Brown streak virus disease and its implications for the movement of cassava germplasm in the east and central African region

Cassava is infected by numerous geminiviruses in Africa and India that cause devastating losses to poor farmers. We here describe the molecular diversity of seven representative cassava mosaic geminiviruses (CMGs) infecting cassava from multiple locations in Tanzania. We report for the first time...


Ndunguru, J.Legg, J.P.Aveling, T.Thompson, G.Fauquet, Claude M.[Molecular biodiversity of cassava begomoviruses in Tanzania: evolution of cassava geminiviruses in Africa and evidence for East Africa being a center of diversity of cassava geminiviruses]Molecular biodiversity of cassava begomoviruses in Tanzania: evolution of cassava geminiviruses in Africa and evidence for East Africa being a center of diversity of cassava geminiviruses

Virus diseases present major constraints to production of okra (Abelmoschus esculentus) in Cameroon. However, the identity of these viruses had not been determined prior to this study. Detection of begomoviruses in okra using polymerase chain reaction (PCR) has been problematic because of interfe...

Les maladies associees aux virus constituent des contraintes majeures a la production du gombo (Abetmoschusescu/enlus) au Cameroun. Toutefois, l'identite de ces virus n'a jusqu'ici pas ete d6termin6e. La d6tection des begomoviruschez le gombo par R6action de Polymerisation en Chaine (RPC) s'avere...


Leke, W.N.Ramsell, J.N.Titanji, V.P.Legg, J.P.Brown, J.Ngeve, J.Njualem, D.Fondong, V.N.Kvarnheden, A.[Detection and identification of begomoviruses from landraces of okra (Abelmoschus esculentus) in Cameroon]Detection and identification of begomoviruses from landraces of okra (Abelmoschus esculentus) in Cameroon
Legg, J.P.Owor, B.Sseruwagi, P.Ndunguru, J.[Cassava mosaic virus disease in East and Central Africa: epidemiology and management of a regional pandemic]Cassava mosaic virus disease in East and Central Africa: epidemiology and management of a regional pandemic

Cassava mosaic disease (CMD) is the major production constraint on cassava ( Manihot esculenta ) in Angola. Previous reports derived from single samples recorded the presence of African cassava mosaic virus (ACMV) and East African cassava mosaic virus (EACMV) in Angola. Regional CMD monitoring in...


Lava Kumar, P.Akinbade, S.A.Dixon, Alfred G.O.Mahungu, N.M.Mutunda, M.P.Kiala, D.Londa, L.Legg, J.P.[First report of the occurrence of East African cassava mosaic virusUganda (EACMVUG) in Angola]First report of the occurrence of East African cassava mosaic virusUganda (EACMVUG) in Angola

As a case study to document the current characteristics of cassava mosaic virus disease (CMD) in post epidemic areas, surveys were carried out, in 2003 and2004, in Siaya District of western Kenya. This was an area affected by a severe CMD pandemic in the late 1990s. Data recorded on cassava varie...


Mallowa, S.Isutsa, D.Kamau, A.Obonyo, R.Legg, J.P.[Current characteristics of cassava mosaic in postepidemic areas increase the range of possible management options]Current characteristics of cassava mosaic in postepidemic areas increase the range of possible management options

Diagnostic surveys were conducted in 2002 and 2003 in order to provide a comprehensive and detailed assessment of the status of cassava mosaic disease (CMD) in the Republic of Congo (ROC) and to determine if the disease was spreading. In 2002, 105 farmers’ fields were assessed in the four major c...


Ntawuruhunga, PheneasOkao-Okuja, G.Bembe, A.Obambi, M.Armand Mvila, J.C.Legg, J.P.[Incidence and severity of cassava mosaic disease in the Republic of Congo]Incidence and severity of cassava mosaic disease in the Republic of Congo
Autor: Legg, J.P.

The ecology of the Bemisia tabaci/cassava/African cassava mosaic virus (ACMV) pathosystem is reviewed briefly with special attention given to the parameters affecting the pattern of population development of B. tabaci. Significant gaps in our understanding of this system remain, particularly conc...


Legg, J.P.[Bemisia tabaci: the whitefly vector of cassava mosaic geminiviruses in Africa: an ecological perspective]Bemisia tabaci: the whitefly vector of cassava mosaic geminiviruses in Africa: an ecological perspective

Maruthi, M.N.Whitfield, E.C.Kumar, P.Legg, J.P.[Virusindexing, chemo and thermo therapies, and micro propagation for generating virusfree cassava plants: a labouratory manual]Virusindexing, chemo and thermo therapies, and micro propagation for generating virusfree cassava plants: a labouratory manual
Autor: Legg, J.P.

Cassava mosaic disease (CMD), recognized in Africa for more than a century, is now known to be caused by a group of geminiviruses in the genus Begomovirus from the family Geminiviridae. All are transmitted in a persistent manner by the whitefly vector, Bemisia tabaci. Structurally, cassava mosaic...


Legg, J.P.[African cassava mosaic disease]African cassava mosaic disease

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